abs brakes help

[wlf89]

looks like the abs has went out in my 91 gmc s15 jimmy 2wd.
thought the master cylinder went out but it is the abs.

anyway, can anyone give me any help on bypassing the abs unit which ones do i need to tie togther and where do i get the fittings.

there are 2 lines going to the Proportion Valve, and 2 coming out and going to the abs.

then from the abs, theres 2 going to the front wheels, and one going to the rearwheels. that makes 5 total in the abs.3 lines for the front, and 2 lines for the back. i know atleast 1 line is a different size from the others, but not sure
of the sizes yet. would an autozone or a carquest have any thing to make this work?

THANKS